439 lines
15 KiB
Makefile
439 lines
15 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# Backward compatibility
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asflags-y += $(EXTRA_AFLAGS)
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ccflags-y += $(EXTRA_CFLAGS)
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cppflags-y += $(EXTRA_CPPFLAGS)
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ldflags-y += $(EXTRA_LDFLAGS)
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# flags that take effect in current and sub directories
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KBUILD_AFLAGS += $(subdir-asflags-y)
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KBUILD_CFLAGS += $(subdir-ccflags-y)
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# Figure out what we need to build from the various variables
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# ===========================================================================
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# When an object is listed to be built compiled-in and modular,
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# only build the compiled-in version
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obj-m := $(filter-out $(obj-y),$(obj-m))
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# Libraries are always collected in one lib file.
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# Filter out objects already built-in
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lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
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# Determine modorder.
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# Unfortunately, we don't have information about ordering between -y
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# and -m subdirs. Just put -y's first.
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modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
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# Handle objects in subdirs
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# ---------------------------------------------------------------------------
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# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
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# and add the directory to the list of dirs to descend into: $(subdir-y)
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# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
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# and add the directory to the list of dirs to descend into: $(subdir-m)
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__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
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subdir-y += $(__subdir-y)
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__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
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subdir-m += $(__subdir-m)
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obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
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obj-m := $(filter-out %/, $(obj-m))
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# Subdirectories we need to descend into
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subdir-ym := $(sort $(subdir-y) $(subdir-m))
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# if $(foo-objs), $(foo-y), or $(foo-m) exists, foo.o is a composite object
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multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
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multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
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multi-used := $(multi-used-y) $(multi-used-m)
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single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
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# Build list of the parts of our composite objects, our composite
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# objects depend on those (obviously)
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multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
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multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
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# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
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# tell kbuild to descend
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subdir-obj-y := $(filter %/built-in.o, $(obj-y))
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# Replace multi-part objects by their individual parts, look at local dir only
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real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
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real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
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# DTB
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# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
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extra-y += $(dtb-y)
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extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
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# Add subdir path
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extra-y := $(addprefix $(obj)/,$(extra-y))
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always := $(addprefix $(obj)/,$(always))
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targets := $(addprefix $(obj)/,$(targets))
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modorder := $(addprefix $(obj)/,$(modorder))
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obj-y := $(addprefix $(obj)/,$(obj-y))
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obj-m := $(addprefix $(obj)/,$(obj-m))
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lib-y := $(addprefix $(obj)/,$(lib-y))
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subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
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real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
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real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
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single-used-m := $(addprefix $(obj)/,$(single-used-m))
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multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
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multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
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multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
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multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
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subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
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# These flags are needed for modversions and compiling, so we define them here
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# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
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# end up in (or would, if it gets compiled in)
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# Note: Files that end up in two or more modules are compiled without the
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# KBUILD_MODNAME definition. The reason is that any made-up name would
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# differ in different configs.
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name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
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basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
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modname_flags = $(if $(filter 1,$(words $(modname))),\
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-DKBUILD_MODNAME=$(call name-fix,$(modname)))
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orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
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$(ccflags-y) $(CFLAGS_$(basetarget).o)
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_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
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orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
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$(asflags-y) $(AFLAGS_$(basetarget).o)
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_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
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_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
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#
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# Enable gcov profiling flags for a file, directory or for all files depending
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# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
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# (in this order)
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#
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ifeq ($(CONFIG_GCOV_KERNEL),y)
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_c_flags += $(if $(patsubst n%,, \
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$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
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$(CFLAGS_GCOV))
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endif
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#
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# Enable address sanitizer flags for kernel except some files or directories
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# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
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#
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ifeq ($(CONFIG_KASAN),y)
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_c_flags += $(if $(patsubst n%,, \
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$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
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$(CFLAGS_KASAN))
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endif
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ifeq ($(CONFIG_UBSAN),y)
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_c_flags += $(if $(patsubst n%,, \
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$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
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$(CFLAGS_UBSAN))
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endif
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ifeq ($(CONFIG_KCOV),y)
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_c_flags += $(if $(patsubst n%,, \
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$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
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$(CFLAGS_KCOV))
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endif
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# If building the kernel in a separate objtree expand all occurrences
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# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
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ifeq ($(KBUILD_SRC),)
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__c_flags = $(_c_flags)
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__a_flags = $(_a_flags)
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__cpp_flags = $(_cpp_flags)
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else
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# -I$(obj) locates generated .h files
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# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
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# and locates generated .h files
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# FIXME: Replace both with specific CFLAGS* statements in the makefiles
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__c_flags = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
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$(call flags,_c_flags)
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__a_flags = $(call flags,_a_flags)
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__cpp_flags = $(call flags,_cpp_flags)
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endif
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c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
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$(__c_flags) $(modkern_cflags) \
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$(basename_flags) $(modname_flags)
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a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
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$(__a_flags) $(modkern_aflags)
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cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
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$(__cpp_flags)
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ld_flags = $(LDFLAGS) $(ldflags-y)
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DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
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dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
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$(addprefix -I,$(DTC_INCLUDE)) \
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-undef -D__DTS__
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# Finds the multi-part object the current object will be linked into
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modname-multi = $(sort $(foreach m,$(multi-used),\
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$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
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# Useful for describing the dependency of composite objects
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# Usage:
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# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
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define multi_depend
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$(foreach m, $(notdir $1), \
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$(eval $(obj)/$m: \
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$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
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endef
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ifdef REGENERATE_PARSERS
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# LEX
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# ---------------------------------------------------------------------------
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LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
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quiet_cmd_flex = LEX $@
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cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
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.PRECIOUS: $(src)/%.lex.c_shipped
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$(src)/%.lex.c_shipped: $(src)/%.l
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$(call cmd,flex)
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# YACC
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# ---------------------------------------------------------------------------
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YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
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quiet_cmd_bison = YACC $@
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cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
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.PRECIOUS: $(src)/%.tab.c_shipped
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$(src)/%.tab.c_shipped: $(src)/%.y
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$(call cmd,bison)
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quiet_cmd_bison_h = YACC $@
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cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
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.PRECIOUS: $(src)/%.tab.h_shipped
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$(src)/%.tab.h_shipped: $(src)/%.y
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$(call cmd,bison_h)
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endif
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# Shipped files
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# ===========================================================================
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quiet_cmd_shipped = SHIPPED $@
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cmd_shipped = cat $< > $@
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$(obj)/%: $(src)/%_shipped
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$(call cmd,shipped)
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# Commands useful for building a boot image
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# ===========================================================================
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#
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# Use as following:
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#
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# target: source(s) FORCE
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# $(if_changed,ld/objcopy/gzip)
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#
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# and add target to extra-y so that we know we have to
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# read in the saved command line
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# Linking
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# ---------------------------------------------------------------------------
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quiet_cmd_ld = LD $@
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cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
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$(filter-out FORCE,$^) -o $@
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# Objcopy
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# ---------------------------------------------------------------------------
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quiet_cmd_objcopy = OBJCOPY $@
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cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
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# Gzip
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# ---------------------------------------------------------------------------
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quiet_cmd_gzip = GZIP $@
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cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
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(rm -f $@ ; false)
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# DTC
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# ---------------------------------------------------------------------------
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DTC ?= $(objtree)/scripts/dtc/dtc
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# Disable noisy checks by default
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ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
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DTC_FLAGS += -Wno-unit_address_vs_reg \
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-Wno-simple_bus_reg \
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-Wno-unit_address_format \
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-Wno-pci_bridge \
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-Wno-pci_device_bus_num \
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-Wno-pci_device_reg
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endif
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ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
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DTC_FLAGS += -Wnode_name_chars_strict \
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-Wproperty_name_chars_strict
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endif
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DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
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# Generate an assembly file to wrap the output of the device tree compiler
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quiet_cmd_dt_S_dtb= DTB $@
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cmd_dt_S_dtb= \
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( \
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echo '\#include <asm-generic/vmlinux.lds.h>'; \
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echo '.section .dtb.init.rodata,"a"'; \
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echo '.balign STRUCT_ALIGNMENT'; \
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echo '.global __dtb_$(*F)_begin'; \
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echo '__dtb_$(*F)_begin:'; \
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echo '.incbin "$<" '; \
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echo '__dtb_$(*F)_end:'; \
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echo '.global __dtb_$(*F)_end'; \
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echo '.balign STRUCT_ALIGNMENT'; \
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) > $@
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$(obj)/%.dtb.S: $(obj)/%.dtb
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$(call cmd,dt_S_dtb)
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quiet_cmd_dtc = DTC $@
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cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
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$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
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$(DTC) -O dtb -o $@ -b 0 \
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$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
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-d $(depfile).dtc.tmp $(dtc-tmp) ; \
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cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
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$(obj)/%.dtb: $(src)/%.dts FORCE
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$(call if_changed_dep,dtc)
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dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
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# Bzip2
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# ---------------------------------------------------------------------------
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# Bzip2 and LZMA do not include size in file... so we have to fake that;
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# append the size as a 32-bit littleendian number as gzip does.
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size_append = printf $(shell \
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dec_size=0; \
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for F in $1; do \
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fsize=$$(stat -c "%s" $$F); \
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dec_size=$$(expr $$dec_size + $$fsize); \
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done; \
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printf "%08x\n" $$dec_size | \
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sed 's/\(..\)/\1 /g' | { \
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read ch0 ch1 ch2 ch3; \
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for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
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printf '%s%03o' '\\' $$((0x$$ch)); \
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done; \
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} \
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)
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quiet_cmd_bzip2 = BZIP2 $@
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cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
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bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
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(rm -f $@ ; false)
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# Lzma
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# ---------------------------------------------------------------------------
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quiet_cmd_lzma = LZMA $@
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cmd_lzma = (cat $(filter-out FORCE,$^) | \
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lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
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(rm -f $@ ; false)
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quiet_cmd_lzo = LZO $@
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cmd_lzo = (cat $(filter-out FORCE,$^) | \
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lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
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(rm -f $@ ; false)
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quiet_cmd_lz4 = LZ4 $@
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cmd_lz4 = (cat $(filter-out FORCE,$^) | \
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lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
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(rm -f $@ ; false)
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# U-Boot mkimage
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# ---------------------------------------------------------------------------
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MKIMAGE := $(srctree)/scripts/mkuboot.sh
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# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
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# the number of overrides in arch makefiles
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UIMAGE_ARCH ?= $(SRCARCH)
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UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
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UIMAGE_OPTS-y ?=
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UIMAGE_TYPE ?= kernel
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UIMAGE_LOADADDR ?= arch_must_set_this
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UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
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UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
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UIMAGE_IN ?= $<
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UIMAGE_OUT ?= $@
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quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
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cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
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-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
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-T $(UIMAGE_TYPE) \
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-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
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-n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
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# XZ
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# ---------------------------------------------------------------------------
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# Use xzkern to compress the kernel image and xzmisc to compress other things.
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#
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# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
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# of the kernel decompressor. A BCJ filter is used if it is available for
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# the target architecture. xzkern also appends uncompressed size of the data
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# using size_append. The .xz format has the size information available at
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# the end of the file too, but it's in more complex format and it's good to
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# avoid changing the part of the boot code that reads the uncompressed size.
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# Note that the bytes added by size_append will make the xz tool think that
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# the file is corrupt. This is expected.
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#
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# xzmisc doesn't use size_append, so it can be used to create normal .xz
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# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
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# big dictionary would increase the memory usage too much in the multi-call
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# decompression mode. A BCJ filter isn't used either.
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quiet_cmd_xzkern = XZKERN $@
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cmd_xzkern = (cat $(filter-out FORCE,$^) | \
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sh $(srctree)/scripts/xz_wrap.sh && \
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$(call size_append, $(filter-out FORCE,$^))) > $@ || \
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(rm -f $@ ; false)
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quiet_cmd_xzmisc = XZMISC $@
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cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
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xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
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(rm -f $@ ; false)
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# ASM offsets
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# ---------------------------------------------------------------------------
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# Default sed regexp - multiline due to syntax constraints
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#
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# Use [:space:] because LLVM's integrated assembler inserts <tab> around
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# the .ascii directive whereas GCC keeps the <space> as-is.
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define sed-offsets
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's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
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/^->/{s:->#\(.*\):/* \1 */:; \
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s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
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s:->::; p;}'
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endef
|
|
|
|
# Use filechk to avoid rebuilds when a header changes, but the resulting file
|
|
# does not
|
|
define filechk_offsets
|
|
(set -e; \
|
|
echo "#ifndef $2"; \
|
|
echo "#define $2"; \
|
|
echo "/*"; \
|
|
echo " * DO NOT MODIFY."; \
|
|
echo " *"; \
|
|
echo " * This file was generated by Kbuild"; \
|
|
echo " */"; \
|
|
echo ""; \
|
|
sed -ne $(sed-offsets); \
|
|
echo ""; \
|
|
echo "#endif" )
|
|
endef
|